As you've seen before, some hud elements make use of materials. For example, in hudplayerhealth there is:
"PlayerStatusHealthImageBG"
{
"ControlName" "ImagePanel"
"fieldName" "PlayerStatusHealthImageBG"
"xpos" "73"
"ypos" "33"
"zpos" "3"
"wide" "55"
"tall" "55"
"visible" "1"
"enabled" "1"
"image" "../hud/health_bg"
"scaleImage" "1"
}
The "image" value says where the file is located. By default it assumes that all materials will be in the vgui folder, and if they aren't then they have the "../" to work from the root materials folder.
If the vmt is missing, or the vtf that the vmt uses is missing, the source engine missing material will be displayed instead:
The vmt file is what defines a material, and contains certain values and variables about how the texture should be drawn. Multiple different vmt's can point to the same texture file.
If we check out materials\hud\health_bg.vmt it looks like this:
"UnlitGeneric"
{
"$translucent" 1
"$baseTexture" "hud\health_bg"
"$vertexcolor" 1
"$no_fullbright" 1
"$ignorez" 1
"%keywords" "tf"
}
The vtf file is how the file is actually drawn. Check out the tools section for some information about how to edit these.
You can create your own materials as well, and reference them from any hud element. The two important things is that you will need both a vmt and vtf file, and that it should be in the directory (or in a subdirectory inside):
vgui/replay/thumbnails/
The advantage of putting materials in this folder is that they work in sv_pure 2. This is important, as otherwise you would get a missing material issue. If possible, it is also recommended to make new materials than edit existing ones and put them here as well, to keep the edited material in sv_pure 2 as well.
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